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https://issues.apache.org/jira/browse/TEZ-949?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13942174#comment-13942174
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Bikas Saha commented on TEZ-949:
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Why can we not use the appId instead of the randomUUID in the app master itself?
> Handle Session Tokens for Recovery
> ----------------------------------
>
> Key: TEZ-949
> URL: https://issues.apache.org/jira/browse/TEZ-949
> Project: Apache Tez
> Issue Type: Sub-task
> Reporter: Siddharth Seth
> Attachments: TEZ-949.1.patch
>
>
> The tokens used by Fetchers to connect to the ShuffleHandler are generated in
> the AM. Once an AM is restarted, the token will be regenerated - and new
> Reduces will not be able to fetch output from previous Mappers.
> Similar to MAPREDUCE-5042.
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